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New Dupline Analogue Input Modules increase flexibility for building automation applications

09 July 2014

Carlo Gavazzi has enhanced its Dupline bus offering for building automation, with new SHPINNI2 and SHPINA224 decentralised analogue input modules

These enable control systems to interface with environmental sensors in smart building systems which use any type of environmental sensor with a 0/4-20mA or NI/PT1000 output, making it suitable for reducing costs for space temperature sensing (including anti-ligature) CO2 & humidity monitoring and picking up remote hot and cold water temperatures for Legionella prevention.

Typically, these addressable devices are installed behind the environmental sensor and wired by simply looping the 2 wire bus cable from sensor to sensor. Many sensors can be networked together in this way back to the SB2WEB24 Dupline BACnet Gateway/Controller, where all the sensor information is available to the BMS via BACnet over IP or Modbus TCP/IP connection.
This is a considerably simpler and lower cost solution than traditional parallel wiring, where each signal needs a separate connection back to the BMS system. Dupline radically increases the operating distance and I/O capacity reducing the cost and complexity of installations.

SHPINNI2 is a bus powered 2 x Ni1000/Pt1000 input module with input types (Ni1000 or Pt1000) individually selectable. The SHPINA224 is a DC powered input module with 2 x 0-20mA/4-20mA inputs, these are selectable between input type 0-20 mA or 4-20 mA. 

Both modules are a compact size making it suitable to fit in a wall box or small junction box, thereby enabling a decentralised installation concept. The Dupline bus wiring topology is completely free which means the installation can be carried out using the lowest cost route rather than just multi dropping from sensor to sensor. 

Either way this solution is easier and cheaper than traditional parallel wiring, which also reduces the number of DDC’s and sub-panels required and provides higher flexibility for last minute changes and enhancements. A simple unscreened 2 core bus cable is all that is required to make the Dupline connection, a 4 core cable can be used to transmit the power around with the Dupline bus for when you need to power the environmental sensors. CO2 + Temperature + Humidity information is converted from 0/4-20mA to Dupline locally before being transmitted back over the Dupline network to the controller.

These enhanced decentralised analogue Input modules now also operate within -20°- +50°C temperature range and are protected against dust and moisture ingress to IP20. They carry CE marks and are cULus approved according to UL60950.

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